import { Measurement } from './Measurement';
declare abstract class Quantity<TValue, TSign extends string, TImpl extends Quantity<TValue, TSign, any>> implements Measurement<TValue, TSign> {
    private _value;
    private readonly _sign;
    constructor({ value, sign }: Measurement<TValue, TSign>);
    abstract clone(): TImpl;
    get value(): TValue;
    protected set value(newValue: TValue);
    setValue(value: TValue): TImpl;
    get sign(): TSign;
}
export { Quantity };